Here is the German original of what later became Human Action. It was published first in 1940 after Mises’s years in exile in Geneva.
![Nationalokonomie by Mises](https://cdn.mises.org/styles/responsive_6_9_650w/s3/static-page/img/Nationalokonomie_Mises.jpg.webp?itok=xk7kUkfv 650w,https://cdn.mises.org/styles/responsive_6_9_870w/s3/static-page/img/Nationalokonomie_Mises.jpg.webp?itok=TCet5of5 870w,https://cdn.mises.org/styles/responsive_6_9_1090w/s3/static-page/img/Nationalokonomie_Mises.jpg.webp?itok=imKAOotm 1090w,https://cdn.mises.org/styles/responsive_6_9_1310w/s3/static-page/img/Nationalokonomie_Mises.jpg.webp?itok=Bfs8O1LA 1310w,https://cdn.mises.org/styles/responsive_6_9_1530w/s3/static-page/img/Nationalokonomie_Mises.jpg.webp?itok=YQVPhUfb 1530w)
![Ludwig von Mises](https://cdn.mises.org/styles/responsive_6_9_650w/s3/static-page/img/Ludwig%20von%20Mises%20576x720.jpg.webp?itok=_UflIB7_ 650w,https://cdn.mises.org/styles/responsive_6_9_870w/s3/static-page/img/Ludwig%20von%20Mises%20576x720.jpg.webp?itok=wBSQiZyH 870w,https://cdn.mises.org/styles/responsive_6_9_1090w/s3/static-page/img/Ludwig%20von%20Mises%20576x720.jpg.webp?itok=8QkAnVzG 1090w,https://cdn.mises.org/styles/responsive_6_9_1310w/s3/static-page/img/Ludwig%20von%20Mises%20576x720.jpg.webp?itok=SV5lewQF 1310w,https://cdn.mises.org/styles/responsive_6_9_1530w/s3/static-page/img/Ludwig%20von%20Mises%20576x720.jpg.webp?itok=bInofJu9 1530w)
Ludwig von Mises was the acknowledged leader of the Austrian school of economic thought, a prodigious originator in economic theory, and a prolific author. Mises’s writings and lectures encompassed economic theory, history, epistemology, government, and political philosophy. His contributions to economic theory include important clarifications on the quantity theory of money, the theory of the trade cycle, the integration of monetary theory with economic theory in general, and a demonstration that socialism must fail because it cannot solve the problem of economic calculation. Mises was the first scholar to recognize that economics is part of a larger science in human action, a science that he called praxeology.
Editions Union Genf: 1940. Predecessor to Human Action.